Description:ISSUED STAMPS: 1½d marginal block of 6 (3x2) from the left of the sheet, the right-hand units with partial strong 'offset', weak perforations, the central pair with light crease, the variety pair is very fine unmounted. Unlisted in the ACSC. [Geoff Kellow at page 57 states "...all examples seen are over the gum, and therefore caused by transfer of ink by pressure in stacks of finished sheets". Curious, and see the next lot]